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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "content/browser/device_sensors/data_fetcher_shared_memory.h" | |
| 6 | |
| 7 #include "base/logging.h" | |
| 8 #include "base/metrics/histogram.h" | |
| 9 #include "content/browser/device_sensors/ambient_light_mac.h" | |
| 10 #include "third_party/sudden_motion_sensor/sudden_motion_sensor_mac.h" | |
| 11 | |
| 12 namespace { | |
| 13 | |
| 14 const double kMeanGravity = 9.80665; | |
| 15 | |
| 16 double LMUvalueToLux(uint64_t raw_value) { | |
| 17 // Conversion formula from regression. | |
| 18 // https://bugzilla.mozilla.org/show_bug.cgi?id=793728 | |
| 19 // Let x = raw_value, then | |
| 20 // lux = -2.978303814*(10^-27)*x^4 + 2.635687683*(10^-19)*x^3 - | |
| 21 // 3.459747434*(10^-12)*x^2 + 3.905829689*(10^-5)*x - 0.1932594532 | |
| 22 | |
| 23 static const long double k4 = pow(10.L, -7); | |
| 24 static const long double k3 = pow(10.L, -4); | |
| 25 static const long double k2 = pow(10.L, -2); | |
| 26 static const long double k1 = pow(10.L, 5); | |
| 27 long double scaled_value = raw_value / k1; | |
| 28 | |
| 29 long double lux_value = | |
| 30 (-3 * k4 * pow(scaled_value, 4)) + (2.6 * k3 * pow(scaled_value, 3)) + | |
| 31 (-3.4 * k2 * pow(scaled_value, 2)) + (3.9 * scaled_value) - 0.19; | |
| 32 | |
| 33 double lux = ceil(static_cast<double>(lux_value)); | |
| 34 return lux > 0 ? lux : 0; | |
| 35 } | |
| 36 | |
| 37 void FetchLight(content::AmbientLightSensor* sensor, | |
| 38 content::DeviceLightHardwareBuffer* buffer) { | |
| 39 DCHECK(sensor); | |
| 40 DCHECK(buffer); | |
| 41 // Macbook pro has 2 lux values, left and right, we take the average. | |
| 42 // The raw sensor values are converted to lux using LMUvalueToLux(raw_value) | |
| 43 // similar to how it is done in Firefox. | |
| 44 uint64_t lux_value[2]; | |
| 45 if (!sensor->ReadSensorValue(lux_value)) | |
| 46 return; | |
| 47 uint64_t mean = (lux_value[0] + lux_value[1]) / 2; | |
| 48 double lux = LMUvalueToLux(mean); | |
| 49 buffer->seqlock.WriteBegin(); | |
| 50 buffer->data.value = lux; | |
| 51 buffer->seqlock.WriteEnd(); | |
| 52 } | |
| 53 | |
| 54 void FetchMotion(SuddenMotionSensor* sensor, | |
| 55 content::DeviceMotionHardwareBuffer* buffer) { | |
| 56 DCHECK(sensor); | |
| 57 DCHECK(buffer); | |
| 58 | |
| 59 float axis_value[3]; | |
| 60 if (!sensor->ReadSensorValues(axis_value)) | |
| 61 return; | |
| 62 | |
| 63 buffer->seqlock.WriteBegin(); | |
| 64 buffer->data.accelerationIncludingGravityX = axis_value[0] * kMeanGravity; | |
| 65 buffer->data.hasAccelerationIncludingGravityX = true; | |
| 66 buffer->data.accelerationIncludingGravityY = axis_value[1] * kMeanGravity; | |
| 67 buffer->data.hasAccelerationIncludingGravityY = true; | |
| 68 buffer->data.accelerationIncludingGravityZ = axis_value[2] * kMeanGravity; | |
| 69 buffer->data.hasAccelerationIncludingGravityZ = true; | |
| 70 buffer->data.allAvailableSensorsAreActive = true; | |
| 71 buffer->seqlock.WriteEnd(); | |
| 72 } | |
| 73 | |
| 74 void FetchOrientation(SuddenMotionSensor* sensor, | |
| 75 content::DeviceOrientationHardwareBuffer* buffer) { | |
| 76 DCHECK(sensor); | |
| 77 DCHECK(buffer); | |
| 78 | |
| 79 // Retrieve per-axis calibrated values. | |
| 80 float axis_value[3]; | |
| 81 if (!sensor->ReadSensorValues(axis_value)) | |
| 82 return; | |
| 83 | |
| 84 // Transform the accelerometer values to W3C draft angles. | |
| 85 // | |
| 86 // Accelerometer values are just dot products of the sensor axes | |
| 87 // by the gravity vector 'g' with the result for the z axis inverted. | |
| 88 // | |
| 89 // To understand this transformation calculate the 3rd row of the z-x-y | |
| 90 // Euler angles rotation matrix (because of the 'g' vector, only 3rd row | |
| 91 // affects to the result). Note that z-x-y matrix means R = Ry * Rx * Rz. | |
| 92 // Then, assume alpha = 0 and you get this: | |
| 93 // | |
| 94 // x_acc = sin(gamma) | |
| 95 // y_acc = - cos(gamma) * sin(beta) | |
| 96 // z_acc = cos(beta) * cos(gamma) | |
| 97 // | |
| 98 // After that the rest is just a bit of trigonometry. | |
| 99 // | |
| 100 // Also note that alpha can't be provided but it's assumed to be always zero. | |
| 101 // This is necessary in order to provide enough information to solve | |
| 102 // the equations. | |
| 103 // | |
| 104 const double kRad2deg = 180.0 / M_PI; | |
| 105 double beta = kRad2deg * atan2(-axis_value[1], axis_value[2]); | |
| 106 double gamma = kRad2deg * asin(axis_value[0]); | |
| 107 | |
| 108 // Make sure that the interval boundaries comply with the specification. At | |
| 109 // this point, beta is [-180, 180] and gamma is [-90, 90], but the spec has | |
| 110 // the upper bound open on both. | |
| 111 if (beta == 180.0) | |
| 112 beta = -180; // -180 == 180 (upside-down) | |
| 113 if (gamma == 90.0) | |
| 114 gamma = nextafter(90, 0); | |
| 115 | |
| 116 // At this point, DCHECKing is paranoia. Never hurts. | |
| 117 DCHECK_GE(beta, -180.0); | |
| 118 DCHECK_LT(beta, 180.0); | |
| 119 DCHECK_GE(gamma, -90.0); | |
| 120 DCHECK_LT(gamma, 90.0); | |
| 121 | |
| 122 buffer->seqlock.WriteBegin(); | |
| 123 buffer->data.beta = beta; | |
| 124 buffer->data.hasBeta = true; | |
| 125 buffer->data.gamma = gamma; | |
| 126 buffer->data.hasGamma = true; | |
| 127 buffer->data.allAvailableSensorsAreActive = true; | |
| 128 buffer->seqlock.WriteEnd(); | |
| 129 } | |
| 130 | |
| 131 } // namespace | |
| 132 | |
| 133 namespace content { | |
| 134 | |
| 135 DataFetcherSharedMemory::DataFetcherSharedMemory() { | |
| 136 } | |
| 137 | |
| 138 DataFetcherSharedMemory::~DataFetcherSharedMemory() { | |
| 139 } | |
| 140 | |
| 141 void DataFetcherSharedMemory::Fetch(unsigned consumer_bitmask) { | |
| 142 DCHECK(base::MessageLoop::current() == GetPollingMessageLoop()); | |
| 143 DCHECK(consumer_bitmask & CONSUMER_TYPE_ORIENTATION || | |
| 144 consumer_bitmask & CONSUMER_TYPE_MOTION || | |
| 145 consumer_bitmask & CONSUMER_TYPE_LIGHT); | |
| 146 | |
| 147 if (consumer_bitmask & CONSUMER_TYPE_ORIENTATION) | |
| 148 FetchOrientation(sudden_motion_sensor_.get(), orientation_buffer_); | |
| 149 if (consumer_bitmask & CONSUMER_TYPE_MOTION) | |
| 150 FetchMotion(sudden_motion_sensor_.get(), motion_buffer_); | |
| 151 if (consumer_bitmask & CONSUMER_TYPE_LIGHT) | |
| 152 FetchLight(ambient_light_sensor_.get(), light_buffer_); | |
| 153 } | |
| 154 | |
| 155 DataFetcherSharedMemory::FetcherType DataFetcherSharedMemory::GetType() const { | |
| 156 return FETCHER_TYPE_POLLING_CALLBACK; | |
| 157 } | |
| 158 | |
| 159 bool DataFetcherSharedMemory::Start(ConsumerType consumer_type, void* buffer) { | |
| 160 DCHECK(base::MessageLoop::current() == GetPollingMessageLoop()); | |
| 161 DCHECK(buffer); | |
| 162 | |
| 163 switch (consumer_type) { | |
| 164 case CONSUMER_TYPE_MOTION: { | |
| 165 if (!sudden_motion_sensor_) | |
| 166 sudden_motion_sensor_.reset(SuddenMotionSensor::Create()); | |
| 167 bool sudden_motion_sensor_available = | |
| 168 sudden_motion_sensor_.get() != nullptr; | |
| 169 | |
| 170 motion_buffer_ = static_cast<DeviceMotionHardwareBuffer*>(buffer); | |
| 171 UMA_HISTOGRAM_BOOLEAN("InertialSensor.MotionMacAvailable", | |
| 172 sudden_motion_sensor_available); | |
| 173 if (!sudden_motion_sensor_available) { | |
| 174 // No motion sensor available, fire an all-null event. | |
| 175 motion_buffer_->seqlock.WriteBegin(); | |
| 176 motion_buffer_->data.allAvailableSensorsAreActive = true; | |
| 177 motion_buffer_->seqlock.WriteEnd(); | |
| 178 } | |
| 179 return sudden_motion_sensor_available; | |
| 180 } | |
| 181 case CONSUMER_TYPE_ORIENTATION: { | |
| 182 if (!sudden_motion_sensor_) | |
| 183 sudden_motion_sensor_.reset(SuddenMotionSensor::Create()); | |
| 184 bool sudden_motion_sensor_available = | |
| 185 sudden_motion_sensor_.get() != nullptr; | |
| 186 | |
| 187 orientation_buffer_ = | |
| 188 static_cast<DeviceOrientationHardwareBuffer*>(buffer); | |
| 189 UMA_HISTOGRAM_BOOLEAN("InertialSensor.OrientationMacAvailable", | |
| 190 sudden_motion_sensor_available); | |
| 191 if (sudden_motion_sensor_available) { | |
| 192 // On Mac we cannot provide absolute orientation. | |
| 193 orientation_buffer_->seqlock.WriteBegin(); | |
| 194 orientation_buffer_->data.absolute = false; | |
| 195 orientation_buffer_->data.hasAbsolute = true; | |
| 196 orientation_buffer_->seqlock.WriteEnd(); | |
| 197 } else { | |
| 198 // No motion sensor available, fire an all-null event. | |
| 199 orientation_buffer_->seqlock.WriteBegin(); | |
| 200 orientation_buffer_->data.allAvailableSensorsAreActive = true; | |
| 201 orientation_buffer_->seqlock.WriteEnd(); | |
| 202 } | |
| 203 return sudden_motion_sensor_available; | |
| 204 } | |
| 205 case CONSUMER_TYPE_LIGHT: { | |
| 206 if (!ambient_light_sensor_) | |
| 207 ambient_light_sensor_ = AmbientLightSensor::Create(); | |
| 208 bool ambient_light_sensor_available = | |
| 209 ambient_light_sensor_.get() != nullptr; | |
| 210 | |
| 211 light_buffer_ = static_cast<DeviceLightHardwareBuffer*>(buffer); | |
| 212 if (!ambient_light_sensor_available) { | |
| 213 light_buffer_->seqlock.WriteBegin(); | |
| 214 light_buffer_->data.value = std::numeric_limits<double>::infinity(); | |
| 215 light_buffer_->seqlock.WriteEnd(); | |
| 216 } | |
| 217 return ambient_light_sensor_available; | |
| 218 } | |
| 219 default: | |
| 220 NOTREACHED(); | |
| 221 } | |
| 222 return false; | |
| 223 } | |
| 224 | |
| 225 bool DataFetcherSharedMemory::Stop(ConsumerType consumer_type) { | |
| 226 DCHECK(base::MessageLoop::current() == GetPollingMessageLoop()); | |
| 227 | |
| 228 switch (consumer_type) { | |
| 229 case CONSUMER_TYPE_MOTION: | |
| 230 if (motion_buffer_) { | |
| 231 motion_buffer_->seqlock.WriteBegin(); | |
| 232 motion_buffer_->data.allAvailableSensorsAreActive = false; | |
| 233 motion_buffer_->seqlock.WriteEnd(); | |
| 234 motion_buffer_ = nullptr; | |
| 235 } | |
| 236 return true; | |
| 237 case CONSUMER_TYPE_ORIENTATION: | |
| 238 if (orientation_buffer_) { | |
| 239 orientation_buffer_->seqlock.WriteBegin(); | |
| 240 orientation_buffer_->data.allAvailableSensorsAreActive = false; | |
| 241 orientation_buffer_->seqlock.WriteEnd(); | |
| 242 orientation_buffer_ = nullptr; | |
| 243 } | |
| 244 return true; | |
| 245 case CONSUMER_TYPE_LIGHT: | |
| 246 if (light_buffer_) { | |
| 247 light_buffer_->seqlock.WriteBegin(); | |
| 248 light_buffer_->data.value = -1; | |
| 249 light_buffer_->seqlock.WriteEnd(); | |
| 250 light_buffer_ = nullptr; | |
| 251 } | |
| 252 return true; | |
| 253 default: | |
| 254 NOTREACHED(); | |
| 255 } | |
| 256 return false; | |
| 257 } | |
| 258 | |
| 259 } // namespace content | |
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Chromium Code Reviews
Issue 1164563003:
Extract device_sensors to /device via Mojofication (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master